Browse Technical Reports - Air Conditioning and Refrigeration Center by Title

Yin, J.M.(Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1998-07)

A mathematical model of adiabatic refrigerant flow through capillary tubes is presented.
When using this model for R22, Chen et al.' s metastable model was improved by a correction
factor related to Reynolds number. The ...

Yin, J.M.(Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1998-02)

A new theoretical model for predicting short tube orifice performance is presented. The new
model can be used over wide parameter ranges, with subcooling from O°C to 50°C, inlet
pressures as high as 35bar, and inlet ...

Newell, T.A.(Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1997-02)

The coupling of a water-based electrochemical cell and fuel cell are discussed as a means to
form a refrigeration cycle. In the proposed configuration, the process fluids can be passively
driven through the flow circuits. ...

Ragazzi, F.(Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-04)

A study was conducted to determine the influence of heat exchanger design on the
performance of residential air-conditioning systems using zeotropic mixtures as HCFC-22
alternatives.
A computer simulation of the evaporator ...

Davis, B.; Cusano, C.(Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1992-05)

The tribological characteristics of the most common contact
geometries found in compressors of air conditioning and
refrigeration systems have been experimentally investigated by
means of a unique high pressure tribometer ...

Davis, B.; Sheiretov, T.K.; Cusano, C.(Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1992-03)

The tribological characteristics of the most common contact
geometries found in compressors of air conditioning and refrigeration
systems have been experimentally investigated by means of a unique high
pressure tribometer ...

Sheiretov, T.K.; Yoon, H.; Cusano, C.(Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1996-01)

The tribological characteristics of various aluminum alloys, aluminum composites and some
surface treated aluminum are evaluated in lubricant/refrigerant mixtures. All of these evaluations are
based upon a specimen testing ...

Demas, N.G.; Polycarpou, Andreas A.; Conry, T.F.(Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2003-12)

The refrigeration and air conditioning industry has expressed a great interest in the use of carbon dioxide
(CO2) as a refrigerant. CO2 is anticipated to replace HFC refrigerants, which are known to have a negative effect ...

Solzak, T.A.; Polycarpou, Andreas A.(Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2006-06)

Compressors are being required to operate at increasingly severe conditions in order to increase efficiency,
and with the transition from CFC to HFC and natural refrigerants, natural ferrous chloride layers on iron ...

Cannaday, M.L.; Polycarpou, Andreas A.(Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2004-07)

Recent changes in environmental laws requiring the transition from known ozone depleting
chlorofluorocarbon (CFC) refrigerants such as R-22 to safer alternative refrigerants such as fluorocarbon based R-
134A and R-410A, ...

Field, B.S.; Hrnjak, P.S.(Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2007-09)

As microchannel heat exchangers have become more sophisticated in their design, more exact
understanding of the flow inside them is necessary. A decrease in diameter enhances the heat
transfer (which takes place at the ...

Srichai, P.R.; Bullard, C.W.(Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1997-07)

A two-speed compressor was installed in a side-by-side refrigerator in order to validate
simulation results which predicted significant increases in energy efficiency due to better load
matching and reduced temperature ...

Meyer, J.J.; Jabardo, J.M.S.(Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1992-09)

Liquid refrigerant/oil concentrations in a flowing system were monitored using speed of
sound and temperature measurements. Data were taken for R12 with 3GS and 5GS oils
and an R-134a/Ester mixture with concentrations ...

Pergande, S.R.; Polycarpou, Andreas A.; Conry, T.F.(Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2001-12)

Scuffing is a very complex process, without a clear understanding of the fundamental causes behind its
occurrence. It is clear that there are many factors that affect this process, but it is only through obtaining an ...

Brutz, J.M.; Dutton, J.C.; Jacobi, A.M.(Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2005-06)

Improved heat exchanger performance is extremely important in air-conditioning and refrigeration systems,
since it can lead directly to volume, weight, energy, and cost savings. The air-side heat transfer coefficient is ...